pond advice please guys
 

Hi all Ive just built my first pond and cant wait to get it up and running, I'm struggling with deciding on a pump and filter set up as im getting conflicting advice. I'm gonna use a pressurised filter and solids handling pump could some one please advice me whats the best size to use ?? My pond is 1.5m x 1.5m x1m deep its a square construction no sloping sides. its in sunlight for half the day and im planning to have some koi and mixed fish with no plants.
Sorry for got to say the water returning back from the filter will be going through a 400mm water blade.